Phase 3 Destruction Warlock (Demonic Sacrifice Imp / Shadow Bolt) for BT and Hyjal. Run 4-piece Malefic Raiment with Vestments of the Sea-Witch as the chest offset. Hit-cap, then stack spell damage. Zhar'doom and The Skull of Gul'dan are the marquee upgrades; Anetheron's Noose and Slippers of the Seacaller fill the non-set slots.
Shadow Bolt fishing is straightforward — keep ISB uptime high, never clip, and use Death Coil / Howl only when the raid needs it. Curse of Elements / Shadow is assigned by raid lead.
✓ Strengths
✓
Reliable, pet-independent single-target damage
✓
Raid utility via curses and soulstones
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Malefic 4-piece is a clean Tier 6 spike without awkward offsets
✓
Skull of Gul'dan is one of the best caster trinkets in the game
✕ Weaknesses
✕
Shard and curse management still matter on trash-heavy Hyjal pulls
✕
Competes with every caster for Zhar'doom and caster cloaks/rings
✕
Little personal mobility — plan for movement bosses